I would like to be able to configure Growl to pop up a notification when an email is received from a specific sender. But I'm not quite sure where to even begin (other than having Growl installed).

I have a desktop machine at home that's always running and connected to the 'net, so it could run anything necessary.

It's not a Google mail account, so Google Notifier isn't an option, but virtually any other method would be ok. I have Apple's Mail client running in the background at all times on this machine if that's a good starting place.

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